REP30937

• Permit No: C1980004
• IBM Index Class Name: Report
• Doc Date: 9/15/2005
• Doc Name: 2004 AHR Review Letter
• From: DMG
• To: J.E. Stover & Associates
• Annual Report Year: 2004
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver,. Colorado 80203
Phone: [phone]
FAX: [phone]
September 15, 2005
Jim Stover
J.E. Stover & Associates
P.O. Box 60340
Grand Junction, Colorado 81506
STATE OF COLORADO
RE: McClane and Munger Canyon Mines
Permits C-1980-004 (McClane) and C-1981-020 (Munger)
2004 Water Year Annual Hydrology Report
Dear Mr. Stover:
COLORADO
DIVISION OF
MINERALS
GEOLOGY
RECIAM ATION•MINING
SA FETT•SCfEN CF
Bill Owens
Governor
Russell George
Executive Director
Ronald W. Cottony
Division Director
Natural Resource Trustee
The Division has completed review of the 2004 water year Annual Hydrology Report for
McClane and Munger Canyon Mines. We have the following comments and requests:
Review of hydrologic monitoring data reported indicates that hydrologic effects of
the operations are consistent with predictions in the Probable Hydrologic
Consequences sections of the permit applications. Over-all effects of the mine
operations on the hydrologic system appear to be negligible.
We would request one clarification regarding surface water monitoring. The
upstream "undisturbed" sampling site on East Salt Creek (SW-1) is located
downstream of the junction of East Salt Creek and the McClane Creek lower
diversion segment. Water periodically pumped out of the McClane Mine is
discharged into McClane Creek, and as such, the discharge enters East Salt Creek
upstream of SW-1. Please confirm that sampling at SW-1 is not conducted durinc
periods when mine discharge water is contributing flow to East Salt Creek,
upstream of the sample point.
3. A profile survey of the diverted lower segment of the McClane Creek channel was
provided in the report as requested by the Division. The creek was diverted when
the McClane Canyon road was constructed (pre-8/3/771. The road and diversion
had been installed prior to initial permit issuance. A DMG inspection of May 20,
1996 described the channel that had developed below the point of diversion. The
report narrative described lower segments of the channel as having "...the
appearance of a steep sided gully, deeply incised into the colluvial/alluvial
deposits...". The channel was described as approximately 15 feet deep at its tower
end, near the confluence with East Salt Creek.
In 1997, the operator installed 4 wooden gabions along the channel segment to
stabilize the channel bottom during high flow events. A channel profile and
narrative description, and gabion installation details were incorporated into the
permit in 1998 (permit appendix pages M-5 through M-9). The plan also indicated
that the channel segment would be monitored, and that corrective measures would
be approved and implemented, if monitoring reveals that unacceptable erosion is
occurring.